[Intel-gfx] i915: black screen after boot on 915GM (Linux >= 3.4-rc1)

Jani Nikula jani.nikula at linux.intel.com
Fri Mar 14 06:42:54 CET 2014

On Thu, 13 Mar 2014, Krzysztof Mazur <krzysiek at podlesie.net> wrote:
> Hi,
> The commit 3f2dc5ac05714711fc14f2bf0ee5e42d5c08c581 (drm/i915: Fix 915GM
> self-refresh enable/disable) causes strange regression on the HP Compaq
> nc6120. During and after boot to framebuffer console with just LVDS
> the screen is black (backlight on, but black). Starting a X server fixes
> the problem. Connecting an external VGA monitor also fixes the problem.
> Reverting this commit fixes the problem at least up to Linux 3.14.0-rc6.
> I'm still using ACPI video problem workaround that effectively does:
>  static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
>  {
> - return acpi_video_bus_DOS(video, 0,
> + return acpi_video_bus_DOS(video, 3,
>                             acpi_osi_is_win8() ? 1 : 0);
>  }
> in drivers/acpi/video.c.
> I've added dmesgs from the last good commit and the bad commit at:
> https://bugs.freedesktop.org/show_bug.cgi?id=76103

We track this on the bugzilla. Please add any new information (such as
the other patches you have) there. Thanks.


Jani Nikula, Intel Open Source Technology Center

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